Can't disconnect a USB sound device and connect another - Kernel

This is a discussion on Can't disconnect a USB sound device and connect another - Kernel ; -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 .... because it causes lsusb to freeze and gives me this in /var/log/messages: Dec 23 23:27:04 cabrio kernel: usb 2-2: USB disconnect, address 5 Dec 23 23:27:04 cabrio kernel: PGD 110f2067 PUD 110f3067 PMD ...

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Thread: Can't disconnect a USB sound device and connect another

  1. Can't disconnect a USB sound device and connect another

    -----BEGIN PGP SIGNED MESSAGE-----
    Hash: SHA1

    .... because it causes lsusb to freeze and gives me this in /var/log/messages:

    Dec 23 23:27:04 cabrio kernel: usb 2-2: USB disconnect, address 5
    Dec 23 23:27:04 cabrio kernel: PGD 110f2067 PUD 110f3067 PMD 0
    Dec 23 23:27:04 cabrio kernel: CPU 0
    Dec 23 23:27:04 cabrio kernel: Modules linked in: videodev v4l2_common
    v4l1_compat snd_rtctimer binfmt_misc rfcomm l2cap bluetooth capability
    commoncap ppdev powernow_k8 cpufreq_userspace cpufreq_stats cpufreq_powersave
    cpufreq_ondemand freq_table cpufreq_conservative video output sbs container
    dock ac battery ext3 jbd mbcache aes_x86_64 ipv6 it87 hwmon_vid parport_pc lp
    parport loop snd_mpu401 snd_mpu401_uart snd_usb_audio snd_pcm_oss
    snd_mixer_oss snd_pcm snd_seq_dummy snd_page_alloc snd_usb_lib snd_hwdep
    snd_seq_oss analog gameport snd_seq_midi snd_rawmidi snd_seq_midi_event
    snd_seq snd_timer snd_seq_device snd psmouse button soundcore serio_raw
    i2c_nforce2 k8temp i2c_core pcspkr af_packet shpchp pci_hotplug evdev xfs
    sha256 twofish_x86_64 twofish_common cbc blkcipher sg ide_cd cdrom sd_mod
    usbhid hid sata_nv 8139too floppy ata_generic 8139cp mii libata scsi_mod
    amd74xx ide_core forcedeth ehci_hcd ohci_hcd usbcore dm_crypt dm_mirror
    dm_snapshot dm_mod thermal processor fan fuse
    Dec 23 23:27:04 cabrio kernel: Pid: 2052, comm: khubd Not tainted 2.6.23.11 #1
    Dec 23 23:27:04 cabrio kernel: RIP: 0010:[_end+130488219/2130651808]
    [_end+130488219/2130651808] :snd:snd_ctl_dev_disconnect+0x6b/0xb0
    Dec 23 23:27:04 cabrio kernel: RSP: 0018:ffff810037bfdc40 EFLAGS: 00010282
    Dec 23 23:27:04 cabrio kernel: RAX: 0000000000000000 RBX: 0000000000100100
    RCX: 0000000000000018
    Dec 23 23:27:04 cabrio kernel: RDX: 0000000000020004 RSI: 000000000000001d
    RDI: ffff810013e98c08
    Dec 23 23:27:04 cabrio kernel: RBP: ffff8100394631a8 R08: ffff810037bfc000
    R09: 0000000000000000
    Dec 23 23:27:04 cabrio kernel: R10: 0000000000000000 R11: ffffffff88281910
    R12: ffff810039463000
    Dec 23 23:27:04 cabrio kernel: R13: ffff810039463168 R14: 0000000000000000
    R15: ffff810039463000
    Dec 23 23:27:04 cabrio kernel: FS: 00002b24912551e0(0000) GS:ffffffff80533000
    (0000) knlGS:00000000f74b16c0
    Dec 23 23:27:04 cabrio kernel: CS: 0010 DS: 0018 ES: 0018 CR0:
    000000008005003b
    Dec 23 23:27:04 cabrio kernel: CR2: 0000000000100100 CR3: 00000000110f1000
    CR4: 00000000000006e0
    Dec 23 23:27:04 cabrio kernel: DR0: 0000000000000000 DR1: 0000000000000000
    DR2: 0000000000000000
    Dec 23 23:27:04 cabrio kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0
    DR7: 0000000000000400
    Dec 23 23:27:04 cabrio kernel: Process khubd (pid: 2052, threadinfo
    ffff810037bfc000, task ffff81003d67d0c0)
    Dec 23 23:27:04 cabrio kernel: Stack: 0000000000000000 ffff810038850d00
    ffff810039463000 ffff810039463150
    Dec 23 23:27:04 cabrio kernel: 0000000000000000 ffffffff88281e69
    ffff810038850d00 ffffffff882821ac
    Dec 23 23:27:04 cabrio kernel: 0000000000000000 0000000000000000
    ffff810039463000 ffff8100394631e0
    Dec 23 23:27:04 cabrio kernel: Call Trace:
    Dec 23 23:27:04 cabrio kernel:
    [_end+130500873/2130651808] :snd:snd_device_disconnect+0x59/0x90
    Dec 23 23:27:04 cabrio kernel:
    [_end+130501708/2130651808] :snd:snd_device_disconnect_all+0x3c/0x70
    Dec 23 23:27:04 cabrio kernel:
    [_end+130481675/2130651808] :snd:snd_card_disconnect+0x15b/0x1a0
    Dec 23 23:27:04 cabrio kernel:
    [_end+131093678/2130651808] :snd_usb_audio:usb_audio_disconnect+0xae/0x1a0
    Dec 23 23:27:04 cabrio kernel:
    [_end+128211869/2130651808] :usbcore:usb_unbind_interface+0x6d/0xe0
    Dec 23 23:27:04 cabrio kernel: [__device_release_driver+130/192]
    __device_release_driver+0x82/0xc0
    Dec 23 23:27:04 cabrio kernel: [device_release_driver+51/96]
    device_release_driver+0x33/0x60
    Dec 23 23:27:04 cabrio kernel: [bus_remove_device+118/176]
    bus_remove_device+0x76/0xb0
    Dec 23 23:27:04 cabrio kernel: [device_del+417/736] device_del+0x1a1/0x2e0
    Dec 23 23:27:04 cabrio kernel:
    [_end+128198657/2130651808] :usbcore:usb_disable_device+0x91/0x110
    Dec 23 23:27:04 cabrio kernel:
    [_end+128179466/2130651808] :usbcore:usb_disconnect+0xaa/0x150
    Dec 23 23:27:04 cabrio kernel:
    [_end+128181649/2130651808] :usbcore:hub_thread+0x401/0xe30
    Dec 23 23:27:04 cabrio kernel: [thread_return+87/1463]
    thread_return+0x57/0x5b7
    Dec 23 23:27:04 cabrio kernel: [autoremove_wake_function+0/48]
    autoremove_wake_function+0x0/0x30
    Dec 23 23:27:04 cabrio kernel:
    [_end+128180624/2130651808] :usbcore:hub_thread+0x0/0xe30
    Dec 23 23:27:04 cabrio kernel: [kthread+75/128] kthread+0x4b/0x80
    Dec 23 23:27:04 cabrio kernel: [child_rip+10/18] child_rip+0xa/0x12
    Dec 23 23:27:04 cabrio kernel: [kthread+0/128] kthread+0x0/0x80
    Dec 23 23:27:04 cabrio kernel: [child_rip+0/18] child_rip+0x0/0x12
    Dec 23 23:27:04 cabrio kernel:
    Dec 23 23:27:04 cabrio kernel:
    Dec 23 23:27:04 cabrio kernel: Code: 48 8b 03 0f 18 08 48 39 eb 75 ca 4c 89 ef
    e8 d2 35 fd f7 ba
    Dec 23 23:27:04 cabrio kernel: RSP

    Is there a way to exchange USB audio devices without rebooting?

    Beste regards,
    Victor
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  2. Re: Can't disconnect a USB sound device and connect another

    On Sun, 23 Dec 2007 23:36:11 +0100 Victor Hahn wrote:

    > -----BEGIN PGP SIGNED MESSAGE-----
    > Hash: SHA1
    >
    > ... because it causes lsusb to freeze and gives me this in /var/log/messages:


    Has this always happened, or is it something we introduced in a recent
    kernel?

    > Dec 23 23:27:04 cabrio kernel: usb 2-2: USB disconnect, address 5
    > Dec 23 23:27:04 cabrio kernel: PGD 110f2067 PUD 110f3067 PMD 0
    > Dec 23 23:27:04 cabrio kernel: CPU 0
    > Dec 23 23:27:04 cabrio kernel: Modules linked in: videodev v4l2_common
    > v4l1_compat snd_rtctimer binfmt_misc rfcomm l2cap bluetooth capability
    > commoncap ppdev powernow_k8 cpufreq_userspace cpufreq_stats cpufreq_powersave
    > cpufreq_ondemand freq_table cpufreq_conservative video output sbs container
    > dock ac battery ext3 jbd mbcache aes_x86_64 ipv6 it87 hwmon_vid parport_pc lp
    > parport loop snd_mpu401 snd_mpu401_uart snd_usb_audio snd_pcm_oss
    > snd_mixer_oss snd_pcm snd_seq_dummy snd_page_alloc snd_usb_lib snd_hwdep
    > snd_seq_oss analog gameport snd_seq_midi snd_rawmidi snd_seq_midi_event
    > snd_seq snd_timer snd_seq_device snd psmouse button soundcore serio_raw
    > i2c_nforce2 k8temp i2c_core pcspkr af_packet shpchp pci_hotplug evdev xfs
    > sha256 twofish_x86_64 twofish_common cbc blkcipher sg ide_cd cdrom sd_mod
    > usbhid hid sata_nv 8139too floppy ata_generic 8139cp mii libata scsi_mod
    > amd74xx ide_core forcedeth ehci_hcd ohci_hcd usbcore dm_crypt dm_mirror
    > dm_snapshot dm_mod thermal processor fan fuse
    > Dec 23 23:27:04 cabrio kernel: Pid: 2052, comm: khubd Not tainted 2.6.23.11 #1
    > Dec 23 23:27:04 cabrio kernel: RIP: 0010:[_end+130488219/2130651808]
    > [_end+130488219/2130651808] :snd:snd_ctl_dev_disconnect+0x6b/0xb0
    > Dec 23 23:27:04 cabrio kernel: RSP: 0018:ffff810037bfdc40 EFLAGS: 00010282
    > Dec 23 23:27:04 cabrio kernel: RAX: 0000000000000000 RBX: 0000000000100100
    > RCX: 0000000000000018
    > Dec 23 23:27:04 cabrio kernel: RDX: 0000000000020004 RSI: 000000000000001d
    > RDI: ffff810013e98c08
    > Dec 23 23:27:04 cabrio kernel: RBP: ffff8100394631a8 R08: ffff810037bfc000
    > R09: 0000000000000000
    > Dec 23 23:27:04 cabrio kernel: R10: 0000000000000000 R11: ffffffff88281910
    > R12: ffff810039463000
    > Dec 23 23:27:04 cabrio kernel: R13: ffff810039463168 R14: 0000000000000000
    > R15: ffff810039463000
    > Dec 23 23:27:04 cabrio kernel: FS: 00002b24912551e0(0000) GS:ffffffff80533000
    > (0000) knlGS:00000000f74b16c0
    > Dec 23 23:27:04 cabrio kernel: CS: 0010 DS: 0018 ES: 0018 CR0:
    > 000000008005003b
    > Dec 23 23:27:04 cabrio kernel: CR2: 0000000000100100 CR3: 00000000110f1000
    > CR4: 00000000000006e0
    > Dec 23 23:27:04 cabrio kernel: DR0: 0000000000000000 DR1: 0000000000000000
    > DR2: 0000000000000000
    > Dec 23 23:27:04 cabrio kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0
    > DR7: 0000000000000400
    > Dec 23 23:27:04 cabrio kernel: Process khubd (pid: 2052, threadinfo
    > ffff810037bfc000, task ffff81003d67d0c0)
    > Dec 23 23:27:04 cabrio kernel: Stack: 0000000000000000 ffff810038850d00
    > ffff810039463000 ffff810039463150
    > Dec 23 23:27:04 cabrio kernel: 0000000000000000 ffffffff88281e69
    > ffff810038850d00 ffffffff882821ac
    > Dec 23 23:27:04 cabrio kernel: 0000000000000000 0000000000000000
    > ffff810039463000 ffff8100394631e0
    > Dec 23 23:27:04 cabrio kernel: Call Trace:
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+130500873/2130651808] :snd:snd_device_disconnect+0x59/0x90
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+130501708/2130651808] :snd:snd_device_disconnect_all+0x3c/0x70
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+130481675/2130651808] :snd:snd_card_disconnect+0x15b/0x1a0
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+131093678/2130651808] :snd_usb_audio:usb_audio_disconnect+0xae/0x1a0
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+128211869/2130651808] :usbcore:usb_unbind_interface+0x6d/0xe0
    > Dec 23 23:27:04 cabrio kernel: [__device_release_driver+130/192]
    > __device_release_driver+0x82/0xc0
    > Dec 23 23:27:04 cabrio kernel: [device_release_driver+51/96]
    > device_release_driver+0x33/0x60
    > Dec 23 23:27:04 cabrio kernel: [bus_remove_device+118/176]
    > bus_remove_device+0x76/0xb0
    > Dec 23 23:27:04 cabrio kernel: [device_del+417/736] device_del+0x1a1/0x2e0
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+128198657/2130651808] :usbcore:usb_disable_device+0x91/0x110
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+128179466/2130651808] :usbcore:usb_disconnect+0xaa/0x150
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+128181649/2130651808] :usbcore:hub_thread+0x401/0xe30
    > Dec 23 23:27:04 cabrio kernel: [thread_return+87/1463]
    > thread_return+0x57/0x5b7
    > Dec 23 23:27:04 cabrio kernel: [autoremove_wake_function+0/48]
    > autoremove_wake_function+0x0/0x30
    > Dec 23 23:27:04 cabrio kernel:
    > [_end+128180624/2130651808] :usbcore:hub_thread+0x0/0xe30
    > Dec 23 23:27:04 cabrio kernel: [kthread+75/128] kthread+0x4b/0x80
    > Dec 23 23:27:04 cabrio kernel: [child_rip+10/18] child_rip+0xa/0x12
    > Dec 23 23:27:04 cabrio kernel: [kthread+0/128] kthread+0x0/0x80
    > Dec 23 23:27:04 cabrio kernel: [child_rip+0/18] child_rip+0x0/0x12
    > Dec 23 23:27:04 cabrio kernel:
    > Dec 23 23:27:04 cabrio kernel:
    > Dec 23 23:27:04 cabrio kernel: Code: 48 8b 03 0f 18 08 48 39 eb 75 ca 4c 89 ef
    > e8 d2 35 fd f7 ba
    > Dec 23 23:27:04 cabrio kernel: RSP
    >
    > Is there a way to exchange USB audio devices without rebooting?


    First we have to work out if it's a USB bug or an ALSA bug. I'd guess
    ALSA, but not with a lot of confidence.

    Anyone?
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  3. Re: Can't disconnect a USB sound device and connect another

    On Tue, 25 Dec 2007, Andrew Morton wrote:

    > On Sun, 23 Dec 2007 23:36:11 +0100 Victor Hahn wrote:
    >
    > > -----BEGIN PGP SIGNED MESSAGE-----
    > > Hash: SHA1
    > >
    > > ... because it causes lsusb to freeze and gives me this in /var/log/messages:

    >
    > Has this always happened, or is it something we introduced in a recent
    > kernel?
    >
    > > Dec 23 23:27:04 cabrio kernel: usb 2-2: USB disconnect, address 5
    > > Dec 23 23:27:04 cabrio kernel: PGD 110f2067 PUD 110f3067 PMD 0
    > > Dec 23 23:27:04 cabrio kernel: CPU 0
    > > Dec 23 23:27:04 cabrio kernel: Modules linked in: videodev v4l2_common
    > > v4l1_compat snd_rtctimer binfmt_misc rfcomm l2cap bluetooth capability

    ....
    > > Dec 23 23:27:04 cabrio kernel: Pid: 2052, comm: khubd Not tainted 2.6.23.11 #1
    > > Dec 23 23:27:04 cabrio kernel: RIP: 0010:[_end+130488219/2130651808]
    > > [_end+130488219/2130651808] :snd:snd_ctl_dev_disconnect+0x6b/0xb0
    > > Dec 23 23:27:04 cabrio kernel: RSP: 0018:ffff810037bfdc40 EFLAGS: 00010282
    > > Dec 23 23:27:04 cabrio kernel: RAX: 0000000000000000 RBX: 0000000000100100
    > > RCX: 0000000000000018
    > > Dec 23 23:27:04 cabrio kernel: RDX: 0000000000020004 RSI: 000000000000001d
    > > RDI: ffff810013e98c08
    > > Dec 23 23:27:04 cabrio kernel: RBP: ffff8100394631a8 R08: ffff810037bfc000
    > > R09: 0000000000000000

    ....
    > > Dec 23 23:27:04 cabrio kernel: Process khubd (pid: 2052, threadinfo
    > > ffff810037bfc000, task ffff81003d67d0c0)
    > > Dec 23 23:27:04 cabrio kernel: Stack: 0000000000000000 ffff810038850d00
    > > ffff810039463000 ffff810039463150
    > > Dec 23 23:27:04 cabrio kernel: 0000000000000000 ffffffff88281e69
    > > ffff810038850d00 ffffffff882821ac
    > > Dec 23 23:27:04 cabrio kernel: 0000000000000000 0000000000000000
    > > ffff810039463000 ffff8100394631e0
    > > Dec 23 23:27:04 cabrio kernel: Call Trace:
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+130500873/2130651808] :snd:snd_device_disconnect+0x59/0x90
    > > Dec 23 23:27:04 cabrio kernel:

    ....
    > > Is there a way to exchange USB audio devices without rebooting?

    >
    > First we have to work out if it's a USB bug or an ALSA bug. I'd guess
    > ALSA, but not with a lot of confidence.
    >
    > Anyone?


    There have been similar reports of this bug. To me it looks like an
    ALSA problem. The routine in question, snd_ctl_dev_disconnect(), is an
    ALSA callback and doesn't contain any USB code.

    A good way to start would be to obtain a disassembly listing of that
    routine, so we can find out what C statement caused the bug.

    Alan Stern

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  4. Re: Can't disconnect a USB sound device and connect another

    On Tue, 25 Dec 2007, Andrew Morton wrote:

    > On Sun, 23 Dec 2007 23:36:11 +0100 Victor Hahn wrote:
    >
    > > -----BEGIN PGP SIGNED MESSAGE-----
    > > Hash: SHA1
    > >
    > > ... because it causes lsusb to freeze and gives me this in /var/log/messages:

    >
    > Has this always happened, or is it something we introduced in a recent
    > kernel?
    >
    > > Dec 23 23:27:04 cabrio kernel: usb 2-2: USB disconnect, address 5
    > > Dec 23 23:27:04 cabrio kernel: PGD 110f2067 PUD 110f3067 PMD 0
    > > Dec 23 23:27:04 cabrio kernel: CPU 0
    > > Dec 23 23:27:04 cabrio kernel: Modules linked in: videodev v4l2_common
    > > v4l1_compat snd_rtctimer binfmt_misc rfcomm l2cap bluetooth capability
    > > commoncap ppdev powernow_k8 cpufreq_userspace cpufreq_stats cpufreq_powersave
    > > cpufreq_ondemand freq_table cpufreq_conservative video output sbs container
    > > dock ac battery ext3 jbd mbcache aes_x86_64 ipv6 it87 hwmon_vid parport_pc lp
    > > parport loop snd_mpu401 snd_mpu401_uart snd_usb_audio snd_pcm_oss
    > > snd_mixer_oss snd_pcm snd_seq_dummy snd_page_alloc snd_usb_lib snd_hwdep
    > > snd_seq_oss analog gameport snd_seq_midi snd_rawmidi snd_seq_midi_event
    > > snd_seq snd_timer snd_seq_device snd psmouse button soundcore serio_raw
    > > i2c_nforce2 k8temp i2c_core pcspkr af_packet shpchp pci_hotplug evdev xfs
    > > sha256 twofish_x86_64 twofish_common cbc blkcipher sg ide_cd cdrom sd_mod
    > > usbhid hid sata_nv 8139too floppy ata_generic 8139cp mii libata scsi_mod
    > > amd74xx ide_core forcedeth ehci_hcd ohci_hcd usbcore dm_crypt dm_mirror
    > > dm_snapshot dm_mod thermal processor fan fuse
    > > Dec 23 23:27:04 cabrio kernel: Pid: 2052, comm: khubd Not tainted 2.6.23.11 #1
    > > Dec 23 23:27:04 cabrio kernel: RIP: 0010:[_end+130488219/2130651808]
    > > [_end+130488219/2130651808] :snd:snd_ctl_dev_disconnect+0x6b/0xb0
    > > Dec 23 23:27:04 cabrio kernel: RSP: 0018:ffff810037bfdc40 EFLAGS: 00010282
    > > Dec 23 23:27:04 cabrio kernel: RAX: 0000000000000000 RBX: 0000000000100100
    > > RCX: 0000000000000018
    > > Dec 23 23:27:04 cabrio kernel: RDX: 0000000000020004 RSI: 000000000000001d
    > > RDI: ffff810013e98c08
    > > Dec 23 23:27:04 cabrio kernel: RBP: ffff8100394631a8 R08: ffff810037bfc000
    > > R09: 0000000000000000
    > > Dec 23 23:27:04 cabrio kernel: R10: 0000000000000000 R11: ffffffff88281910
    > > R12: ffff810039463000
    > > Dec 23 23:27:04 cabrio kernel: R13: ffff810039463168 R14: 0000000000000000
    > > R15: ffff810039463000
    > > Dec 23 23:27:04 cabrio kernel: FS: 00002b24912551e0(0000) GS:ffffffff80533000
    > > (0000) knlGS:00000000f74b16c0
    > > Dec 23 23:27:04 cabrio kernel: CS: 0010 DS: 0018 ES: 0018 CR0:
    > > 000000008005003b
    > > Dec 23 23:27:04 cabrio kernel: CR2: 0000000000100100 CR3: 00000000110f1000
    > > CR4: 00000000000006e0
    > > Dec 23 23:27:04 cabrio kernel: DR0: 0000000000000000 DR1: 0000000000000000
    > > DR2: 0000000000000000
    > > Dec 23 23:27:04 cabrio kernel: DR3: 0000000000000000 DR6: 00000000ffff0ff0
    > > DR7: 0000000000000400
    > > Dec 23 23:27:04 cabrio kernel: Process khubd (pid: 2052, threadinfo
    > > ffff810037bfc000, task ffff81003d67d0c0)
    > > Dec 23 23:27:04 cabrio kernel: Stack: 0000000000000000 ffff810038850d00
    > > ffff810039463000 ffff810039463150
    > > Dec 23 23:27:04 cabrio kernel: 0000000000000000 ffffffff88281e69
    > > ffff810038850d00 ffffffff882821ac
    > > Dec 23 23:27:04 cabrio kernel: 0000000000000000 0000000000000000
    > > ffff810039463000 ffff8100394631e0
    > > Dec 23 23:27:04 cabrio kernel: Call Trace:
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+130500873/2130651808] :snd:snd_device_disconnect+0x59/0x90
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+130501708/2130651808] :snd:snd_device_disconnect_all+0x3c/0x70
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+130481675/2130651808] :snd:snd_card_disconnect+0x15b/0x1a0
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+131093678/2130651808] :snd_usb_audio:usb_audio_disconnect+0xae/0x1a0
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+128211869/2130651808] :usbcore:usb_unbind_interface+0x6d/0xe0
    > > Dec 23 23:27:04 cabrio kernel: [__device_release_driver+130/192]
    > > __device_release_driver+0x82/0xc0
    > > Dec 23 23:27:04 cabrio kernel: [device_release_driver+51/96]
    > > device_release_driver+0x33/0x60
    > > Dec 23 23:27:04 cabrio kernel: [bus_remove_device+118/176]
    > > bus_remove_device+0x76/0xb0
    > > Dec 23 23:27:04 cabrio kernel: [device_del+417/736] device_del+0x1a1/0x2e0
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+128198657/2130651808] :usbcore:usb_disable_device+0x91/0x110
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+128179466/2130651808] :usbcore:usb_disconnect+0xaa/0x150
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+128181649/2130651808] :usbcore:hub_thread+0x401/0xe30
    > > Dec 23 23:27:04 cabrio kernel: [thread_return+87/1463]
    > > thread_return+0x57/0x5b7
    > > Dec 23 23:27:04 cabrio kernel: [autoremove_wake_function+0/48]
    > > autoremove_wake_function+0x0/0x30
    > > Dec 23 23:27:04 cabrio kernel:
    > > [_end+128180624/2130651808] :usbcore:hub_thread+0x0/0xe30
    > > Dec 23 23:27:04 cabrio kernel: [kthread+75/128] kthread+0x4b/0x80
    > > Dec 23 23:27:04 cabrio kernel: [child_rip+10/18] child_rip+0xa/0x12
    > > Dec 23 23:27:04 cabrio kernel: [kthread+0/128] kthread+0x0/0x80
    > > Dec 23 23:27:04 cabrio kernel: [child_rip+0/18] child_rip+0x0/0x12
    > > Dec 23 23:27:04 cabrio kernel:
    > > Dec 23 23:27:04 cabrio kernel:
    > > Dec 23 23:27:04 cabrio kernel: Code: 48 8b 03 0f 18 08 48 39 eb 75 ca 4c 89 ef
    > > e8 d2 35 fd f7 ba
    > > Dec 23 23:27:04 cabrio kernel: RSP
    > >
    > > Is there a way to exchange USB audio devices without rebooting?

    >
    > First we have to work out if it's a USB bug or an ALSA bug. I'd guess
    > ALSA, but not with a lot of confidence.
    >
    > Anyone?


    See

    http://bugzilla.kernel.org/show_bug.cgi?id=9196

    This looks the same as that.

    Alan Stern

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